Mercurial > dropbear
annotate svr-chansession.c @ 332:6f90e5fd42cc
fix accidentally changed == vs != operators
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 11 Jun 2006 16:37:46 +0000 |
parents | d6b8815a9b5e |
children | 2eb5a8514905 e7c1a77d2921 |
rev | line source |
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1 /* |
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2 * Dropbear - a SSH2 server |
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3 * |
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4 * Copyright (c) 2002,2003 Matt Johnston |
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5 * All rights reserved. |
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6 * |
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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8 * of this software and associated documentation files (the "Software"), to deal |
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9 * in the Software without restriction, including without limitation the rights |
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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11 * copies of the Software, and to permit persons to whom the Software is |
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12 * furnished to do so, subject to the following conditions: |
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13 * |
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14 * The above copyright notice and this permission notice shall be included in |
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15 * all copies or substantial portions of the Software. |
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16 * |
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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23 * SOFTWARE. */ |
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24 |
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25 #include "includes.h" |
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26 #include "packet.h" |
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27 #include "buffer.h" |
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28 #include "session.h" |
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29 #include "dbutil.h" |
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30 #include "channel.h" |
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31 #include "chansession.h" |
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32 #include "sshpty.h" |
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33 #include "termcodes.h" |
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34 #include "ssh.h" |
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35 #include "random.h" |
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36 #include "utmp.h" |
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37 #include "x11fwd.h" |
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38 #include "agentfwd.h" |
24 | 39 #include "runopts.h" |
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40 |
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41 /* Handles sessions (either shells or programs) requested by the client */ |
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42 |
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43 static int sessioncommand(struct Channel *channel, struct ChanSess *chansess, |
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44 int iscmd, int issubsys); |
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45 static int sessionpty(struct ChanSess * chansess); |
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46 static int sessionsignal(struct ChanSess *chansess); |
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47 static int noptycommand(struct Channel *channel, struct ChanSess *chansess); |
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48 static int ptycommand(struct Channel *channel, struct ChanSess *chansess); |
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49 static int sessionwinchange(struct ChanSess *chansess); |
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50 static void execchild(struct ChanSess *chansess); |
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51 static void addchildpid(struct ChanSess *chansess, pid_t pid); |
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52 static void sesssigchild_handler(int val); |
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53 static void closechansess(struct Channel *channel); |
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54 static int newchansess(struct Channel *channel); |
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55 static void chansessionrequest(struct Channel *channel); |
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56 |
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57 static void send_exitsignalstatus(struct Channel *channel); |
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58 static void send_msg_chansess_exitstatus(struct Channel * channel, |
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59 struct ChanSess * chansess); |
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60 static void send_msg_chansess_exitsignal(struct Channel * channel, |
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61 struct ChanSess * chansess); |
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62 static int sesscheckclose(struct Channel *channel); |
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63 static void get_termmodes(struct ChanSess *chansess); |
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64 |
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65 |
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66 /* required to clear environment */ |
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67 extern char** environ; |
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68 |
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69 static int sesscheckclose(struct Channel *channel) { |
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70 return channel->writefd == -1; |
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71 } |
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72 |
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73 /* Handler for childs exiting, store the state for return to the client */ |
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74 |
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75 /* There's a particular race we have to watch out for: if the forked child |
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76 * executes, exits, and this signal-handler is called, all before the parent |
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77 * gets to run, then the childpids[] array won't have the pid in it. Hence we |
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78 * use the svr_ses.lastexit struct to hold the exit, which is then compared by |
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79 * the parent when it runs. This work correctly at least in the case of a |
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80 * single shell spawned (ie the usual case) */ |
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81 static void sesssigchild_handler(int UNUSED(dummy)) { |
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82 |
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83 int status; |
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84 pid_t pid; |
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85 unsigned int i; |
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86 struct sigaction sa_chld; |
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87 struct exitinfo *exit = NULL; |
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88 |
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89 TRACE(("enter sigchld handler")) |
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90 while ((pid = waitpid(-1, &status, WNOHANG)) > 0) { |
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91 /* find the corresponding chansess */ |
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92 for (i = 0; i < svr_ses.childpidsize; i++) { |
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93 if (svr_ses.childpids[i].pid == pid) { |
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94 |
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95 exit = &svr_ses.childpids[i].chansess->exit; |
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96 break; |
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97 } |
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98 } |
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99 |
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100 /* If the pid wasn't matched, then we might have hit the race mentioned |
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101 * above. So we just store the info for the parent to deal with */ |
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102 if (i == svr_ses.childpidsize) { |
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103 exit = &svr_ses.lastexit; |
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104 } |
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105 |
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106 exit->exitpid = pid; |
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107 if (WIFEXITED(status)) { |
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108 exit->exitstatus = WEXITSTATUS(status); |
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109 } |
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110 if (WIFSIGNALED(status)) { |
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111 exit->exitsignal = WTERMSIG(status); |
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112 #if !defined(AIX) && defined(WCOREDUMP) |
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113 exit->exitcore = WCOREDUMP(status); |
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114 #else |
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115 exit->exitcore = 0; |
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116 #endif |
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117 } else { |
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118 /* we use this to determine how pid exited */ |
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119 exit->exitsignal = -1; |
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120 } |
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121 exit = NULL; |
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122 } |
130
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123 |
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124 |
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125 sa_chld.sa_handler = sesssigchild_handler; |
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126 sa_chld.sa_flags = SA_NOCLDSTOP; |
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127 sigaction(SIGCHLD, &sa_chld, NULL); |
165
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128 TRACE(("leave sigchld handler")) |
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129 } |
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130 |
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131 /* send the exit status or the signal causing termination for a session */ |
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132 /* XXX server */ |
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133 static void send_exitsignalstatus(struct Channel *channel) { |
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134 |
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135 struct ChanSess *chansess = (struct ChanSess*)channel->typedata; |
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136 |
130
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137 if (chansess->exit.exitpid >= 0) { |
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138 if (chansess->exit.exitsignal > 0) { |
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139 send_msg_chansess_exitsignal(channel, chansess); |
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140 } else { |
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141 send_msg_chansess_exitstatus(channel, chansess); |
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142 } |
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143 } |
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144 } |
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145 |
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146 /* send the exitstatus to the client */ |
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147 static void send_msg_chansess_exitstatus(struct Channel * channel, |
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148 struct ChanSess * chansess) { |
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149 |
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150 dropbear_assert(chansess->exit.exitpid != -1); |
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151 dropbear_assert(chansess->exit.exitsignal == -1); |
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152 |
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153 CHECKCLEARTOWRITE(); |
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154 |
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155 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST); |
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156 buf_putint(ses.writepayload, channel->remotechan); |
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157 buf_putstring(ses.writepayload, "exit-status", 11); |
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158 buf_putbyte(ses.writepayload, 0); /* boolean FALSE */ |
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159 buf_putint(ses.writepayload, chansess->exit.exitstatus); |
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160 |
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161 encrypt_packet(); |
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162 |
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163 } |
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164 |
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165 /* send the signal causing the exit to the client */ |
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166 static void send_msg_chansess_exitsignal(struct Channel * channel, |
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167 struct ChanSess * chansess) { |
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168 |
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169 int i; |
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170 char* signame = NULL; |
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171 |
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172 dropbear_assert(chansess->exit.exitpid != -1); |
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173 dropbear_assert(chansess->exit.exitsignal > 0); |
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174 |
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175 CHECKCLEARTOWRITE(); |
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176 |
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177 /* we check that we can match a signal name, otherwise |
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178 * don't send anything */ |
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179 for (i = 0; signames[i].name != NULL; i++) { |
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180 if (signames[i].signal == chansess->exit.exitsignal) { |
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181 signame = signames[i].name; |
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182 break; |
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183 } |
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184 } |
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185 |
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186 if (signame == NULL) { |
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187 return; |
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188 } |
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189 |
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190 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST); |
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191 buf_putint(ses.writepayload, channel->remotechan); |
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192 buf_putstring(ses.writepayload, "exit-signal", 11); |
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193 buf_putbyte(ses.writepayload, 0); /* boolean FALSE */ |
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194 buf_putstring(ses.writepayload, signame, strlen(signame)); |
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195 buf_putbyte(ses.writepayload, chansess->exit.exitcore); |
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196 buf_putstring(ses.writepayload, "", 0); /* error msg */ |
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197 buf_putstring(ses.writepayload, "", 0); /* lang */ |
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198 |
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199 encrypt_packet(); |
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200 } |
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201 |
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202 /* set up a session channel */ |
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203 static int newchansess(struct Channel *channel) { |
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204 |
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205 struct ChanSess *chansess; |
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206 |
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207 dropbear_assert(channel->typedata == NULL); |
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208 |
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209 chansess = (struct ChanSess*)m_malloc(sizeof(struct ChanSess)); |
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210 chansess->cmd = NULL; |
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211 chansess->pid = 0; |
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212 |
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213 /* pty details */ |
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214 chansess->master = -1; |
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215 chansess->slave = -1; |
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216 chansess->tty = NULL; |
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217 chansess->term = NULL; |
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218 |
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219 chansess->exit.exitpid = -1; |
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220 |
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221 channel->typedata = chansess; |
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222 |
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223 #ifndef DISABLE_X11FWD |
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224 chansess->x11listener = NULL; |
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225 chansess->x11authprot = NULL; |
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226 chansess->x11authcookie = NULL; |
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227 #endif |
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228 |
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229 #ifndef DISABLE_AGENTFWD |
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230 chansess->agentlistener = NULL; |
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231 chansess->agentfile = NULL; |
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232 chansess->agentdir = NULL; |
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233 #endif |
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234 |
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235 return 0; |
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236 |
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237 } |
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238 |
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239 /* clean a session channel */ |
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240 static void closechansess(struct Channel *channel) { |
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241 |
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242 struct ChanSess *chansess; |
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243 unsigned int i; |
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244 struct logininfo *li; |
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245 |
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246 chansess = (struct ChanSess*)channel->typedata; |
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247 |
7 | 248 send_exitsignalstatus(channel); |
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249 |
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250 TRACE(("enter closechansess")) |
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251 if (chansess == NULL) { |
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252 TRACE(("leave closechansess: chansess == NULL")) |
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253 return; |
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254 } |
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255 |
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256 m_free(chansess->cmd); |
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257 m_free(chansess->term); |
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258 |
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259 if (chansess->tty) { |
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260 /* write the utmp/wtmp login record */ |
33 | 261 li = login_alloc_entry(chansess->pid, ses.authstate.username, |
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262 ses.remotehost, chansess->tty); |
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263 login_logout(li); |
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264 login_free_entry(li); |
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265 |
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266 pty_release(chansess->tty); |
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267 m_free(chansess->tty); |
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268 } |
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269 |
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270 #ifndef DISABLE_X11FWD |
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271 x11cleanup(chansess); |
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272 #endif |
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273 |
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274 #ifndef DISABLE_AGENTFWD |
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275 agentcleanup(chansess); |
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276 #endif |
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277 |
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278 /* clear child pid entries */ |
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279 for (i = 0; i < svr_ses.childpidsize; i++) { |
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280 if (svr_ses.childpids[i].chansess == chansess) { |
241
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281 dropbear_assert(svr_ses.childpids[i].pid > 0); |
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282 TRACE(("closing pid %d", svr_ses.childpids[i].pid)) |
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283 TRACE(("exitpid = %d", chansess->exit.exitpid)) |
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284 svr_ses.childpids[i].pid = -1; |
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285 svr_ses.childpids[i].chansess = NULL; |
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286 } |
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287 } |
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288 |
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289 m_free(chansess); |
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290 |
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291 TRACE(("leave closechansess")) |
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292 } |
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293 |
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294 /* Handle requests for a channel. These can be execution requests, |
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295 * or x11/authagent forwarding. These are passed to appropriate handlers */ |
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296 static void chansessionrequest(struct Channel *channel) { |
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297 |
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298 unsigned char * type = NULL; |
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299 unsigned int typelen; |
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300 unsigned char wantreply; |
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301 int ret = 1; |
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302 struct ChanSess *chansess; |
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303 |
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304 TRACE(("enter chansessionrequest")) |
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305 |
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306 type = buf_getstring(ses.payload, &typelen); |
179
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307 wantreply = buf_getbool(ses.payload); |
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308 |
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309 if (typelen > MAX_NAME_LEN) { |
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310 TRACE(("leave chansessionrequest: type too long")) /* XXX send error?*/ |
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311 goto out; |
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312 } |
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313 |
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314 chansess = (struct ChanSess*)channel->typedata; |
241
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315 dropbear_assert(chansess != NULL); |
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316 TRACE(("type is %s", type)) |
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317 |
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318 if (strcmp(type, "window-change") == 0) { |
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319 ret = sessionwinchange(chansess); |
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320 } else if (strcmp(type, "shell") == 0) { |
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321 ret = sessioncommand(channel, chansess, 0, 0); |
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322 } else if (strcmp(type, "pty-req") == 0) { |
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323 ret = sessionpty(chansess); |
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324 } else if (strcmp(type, "exec") == 0) { |
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325 ret = sessioncommand(channel, chansess, 1, 0); |
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326 } else if (strcmp(type, "subsystem") == 0) { |
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327 ret = sessioncommand(channel, chansess, 1, 1); |
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328 #ifndef DISABLE_X11FWD |
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329 } else if (strcmp(type, "x11-req") == 0) { |
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330 ret = x11req(chansess); |
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331 #endif |
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332 #ifndef DISABLE_AGENTFWD |
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333 } else if (strcmp(type, "[email protected]") == 0) { |
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334 ret = agentreq(chansess); |
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335 #endif |
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336 } else if (strcmp(type, "signal") == 0) { |
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337 ret = sessionsignal(chansess); |
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338 } else { |
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339 /* etc, todo "env", "subsystem" */ |
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340 } |
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341 |
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342 out: |
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343 |
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344 if (wantreply) { |
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345 if (ret == DROPBEAR_SUCCESS) { |
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346 send_msg_channel_success(channel); |
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347 } else { |
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348 send_msg_channel_failure(channel); |
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349 } |
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350 } |
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351 |
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352 m_free(type); |
165
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Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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353 TRACE(("leave chansessionrequest")) |
4
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354 } |
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355 |
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356 |
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357 /* Send a signal to a session's process as requested by the client*/ |
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358 static int sessionsignal(struct ChanSess *chansess) { |
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359 |
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360 int sig = 0; |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
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diff
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|
361 unsigned char* signame = NULL; |
4
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362 int i; |
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|
363 |
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|
364 if (chansess->pid == 0) { |
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|
365 /* haven't got a process pid yet */ |
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366 return DROPBEAR_FAILURE; |
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|
367 } |
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368 |
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369 signame = buf_getstring(ses.payload, NULL); |
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|
370 |
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371 i = 0; |
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372 while (signames[i].name != 0) { |
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373 if (strcmp(signames[i].name, signame) == 0) { |
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374 sig = signames[i].signal; |
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375 break; |
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|
376 } |
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377 i++; |
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378 } |
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379 |
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380 m_free(signame); |
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381 |
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382 if (sig == 0) { |
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383 /* failed */ |
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384 return DROPBEAR_FAILURE; |
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|
385 } |
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386 |
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387 if (kill(chansess->pid, sig) < 0) { |
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388 return DROPBEAR_FAILURE; |
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|
389 } |
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|
390 |
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391 return DROPBEAR_SUCCESS; |
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|
392 } |
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|
393 |
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394 /* Let the process know that the window size has changed, as notified from the |
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395 * client. Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
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396 static int sessionwinchange(struct ChanSess *chansess) { |
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397 |
40
b4874d772210
- Added terminal mode handling etc for the client, and window change
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diff
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|
398 int termc, termr, termw, termh; |
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399 |
4
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400 if (chansess->master < 0) { |
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|
401 /* haven't got a pty yet */ |
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402 return DROPBEAR_FAILURE; |
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|
403 } |
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404 |
40
b4874d772210
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diff
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405 termc = buf_getint(ses.payload); |
b4874d772210
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33
diff
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406 termr = buf_getint(ses.payload); |
b4874d772210
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407 termw = buf_getint(ses.payload); |
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408 termh = buf_getint(ses.payload); |
4
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409 |
40
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410 pty_change_window_size(chansess->master, termr, termc, termw, termh); |
4
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411 |
315
3eea61bd9993
send success message for successful window change request
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279
diff
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|
412 return DROPBEAR_SUCCESS; |
4
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413 } |
fe6bca95afa7
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414 |
40
b4874d772210
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diff
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|
415 static void get_termmodes(struct ChanSess *chansess) { |
b4874d772210
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diff
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|
416 |
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417 struct termios termio; |
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418 unsigned char opcode; |
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419 unsigned int value; |
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420 const struct TermCode * termcode; |
b4874d772210
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diff
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|
421 unsigned int len; |
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|
422 |
165
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Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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423 TRACE(("enter get_termmodes")) |
40
b4874d772210
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diff
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424 |
b4874d772210
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diff
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|
425 /* Term modes */ |
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diff
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426 /* We'll ignore errors and continue if we can't set modes. |
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33
diff
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|
427 * We're ignoring baud rates since they seem evil */ |
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428 if (tcgetattr(chansess->master, &termio) == -1) { |
b4874d772210
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33
diff
changeset
|
429 return; |
b4874d772210
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diff
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|
430 } |
b4874d772210
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diff
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|
431 |
b4874d772210
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33
diff
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|
432 len = buf_getint(ses.payload); |
62 | 433 TRACE(("term mode str %d p->l %d p->p %d", |
434 len, ses.payload->len , ses.payload->pos)); | |
40
b4874d772210
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33
diff
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|
435 if (len != ses.payload->len - ses.payload->pos) { |
b4874d772210
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33
diff
changeset
|
436 dropbear_exit("bad term mode string"); |
b4874d772210
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33
diff
changeset
|
437 } |
b4874d772210
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33
diff
changeset
|
438 |
b4874d772210
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33
diff
changeset
|
439 if (len == 0) { |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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133
diff
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|
440 TRACE(("leave get_termmodes: empty terminal modes string")) |
171
8e68dbe8687b
put back 'return;' on empty terminal mode strings which was erroneously
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165
diff
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|
441 return; |
40
b4874d772210
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33
diff
changeset
|
442 } |
b4874d772210
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33
diff
changeset
|
443 |
b4874d772210
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33
diff
changeset
|
444 while (((opcode = buf_getbyte(ses.payload)) != 0x00) && opcode <= 159) { |
b4874d772210
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33
diff
changeset
|
445 |
b4874d772210
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33
diff
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|
446 /* must be before checking type, so that value is consumed even if |
b4874d772210
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33
diff
changeset
|
447 * we don't use it */ |
b4874d772210
- Added terminal mode handling etc for the client, and window change
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33
diff
changeset
|
448 value = buf_getint(ses.payload); |
b4874d772210
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33
diff
changeset
|
449 |
b4874d772210
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33
diff
changeset
|
450 /* handle types of code */ |
b4874d772210
- Added terminal mode handling etc for the client, and window change
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33
diff
changeset
|
451 if (opcode > MAX_TERMCODE) { |
b4874d772210
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33
diff
changeset
|
452 continue; |
b4874d772210
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33
diff
changeset
|
453 } |
b4874d772210
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33
diff
changeset
|
454 termcode = &termcodes[(unsigned int)opcode]; |
b4874d772210
- Added terminal mode handling etc for the client, and window change
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33
diff
changeset
|
455 |
b4874d772210
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33
diff
changeset
|
456 |
b4874d772210
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33
diff
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|
457 switch (termcode->type) { |
b4874d772210
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33
diff
changeset
|
458 |
b4874d772210
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33
diff
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|
459 case TERMCODE_NONE: |
b4874d772210
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33
diff
changeset
|
460 break; |
b4874d772210
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33
diff
changeset
|
461 |
b4874d772210
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33
diff
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|
462 case TERMCODE_CONTROLCHAR: |
b4874d772210
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33
diff
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|
463 termio.c_cc[termcode->mapcode] = value; |
b4874d772210
- Added terminal mode handling etc for the client, and window change
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33
diff
changeset
|
464 break; |
b4874d772210
- Added terminal mode handling etc for the client, and window change
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33
diff
changeset
|
465 |
b4874d772210
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33
diff
changeset
|
466 case TERMCODE_INPUT: |
b4874d772210
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33
diff
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|
467 if (value) { |
b4874d772210
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33
diff
changeset
|
468 termio.c_iflag |= termcode->mapcode; |
b4874d772210
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33
diff
changeset
|
469 } else { |
b4874d772210
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33
diff
changeset
|
470 termio.c_iflag &= ~(termcode->mapcode); |
b4874d772210
- Added terminal mode handling etc for the client, and window change
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33
diff
changeset
|
471 } |
b4874d772210
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parents:
33
diff
changeset
|
472 break; |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
473 |
b4874d772210
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33
diff
changeset
|
474 case TERMCODE_OUTPUT: |
b4874d772210
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33
diff
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|
475 if (value) { |
b4874d772210
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33
diff
changeset
|
476 termio.c_oflag |= termcode->mapcode; |
b4874d772210
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33
diff
changeset
|
477 } else { |
b4874d772210
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33
diff
changeset
|
478 termio.c_oflag &= ~(termcode->mapcode); |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
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33
diff
changeset
|
479 } |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
480 break; |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
481 |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
482 case TERMCODE_LOCAL: |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
483 if (value) { |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
484 termio.c_lflag |= termcode->mapcode; |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
485 } else { |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
486 termio.c_lflag &= ~(termcode->mapcode); |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
487 } |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
488 break; |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
489 |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
490 case TERMCODE_CONTROL: |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
491 if (value) { |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
492 termio.c_cflag |= termcode->mapcode; |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
493 } else { |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
494 termio.c_cflag &= ~(termcode->mapcode); |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
495 } |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
496 break; |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
497 |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
498 } |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
499 } |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
500 if (tcsetattr(chansess->master, TCSANOW, &termio) < 0) { |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
501 dropbear_log(LOG_INFO, "error setting terminal attributes"); |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
502 } |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
133
diff
changeset
|
503 TRACE(("leave get_termmodes")) |
40
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
504 } |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
505 |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
506 /* Set up a session pty which will be used to execute the shell or program. |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
507 * The pty is allocated now, and kept for when the shell/program executes. |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
508 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
509 static int sessionpty(struct ChanSess * chansess) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
510 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
511 unsigned int termlen; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
512 unsigned char namebuf[65]; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
513 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
133
diff
changeset
|
514 TRACE(("enter sessionpty")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
515 chansess->term = buf_getstring(ses.payload, &termlen); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
516 if (termlen > MAX_TERM_LEN) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
517 /* TODO send disconnect ? */ |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
133
diff
changeset
|
518 TRACE(("leave sessionpty: term len too long")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
519 return DROPBEAR_FAILURE; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
520 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
521 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
522 /* allocate the pty */ |
108
10f4d3319780
- added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
96
diff
changeset
|
523 if (chansess->master != -1) { |
10f4d3319780
- added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
96
diff
changeset
|
524 dropbear_exit("multiple pty requests"); |
10f4d3319780
- added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
96
diff
changeset
|
525 } |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
526 if (pty_allocate(&chansess->master, &chansess->slave, namebuf, 64) == 0) { |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
133
diff
changeset
|
527 TRACE(("leave sessionpty: failed to allocate pty")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
528 return DROPBEAR_FAILURE; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
529 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
530 |
11
f76c9389e9e0
Mostly done with the listener changeover
Matt Johnston <matt@ucc.asn.au>
parents:
9
diff
changeset
|
531 chansess->tty = (char*)m_strdup(namebuf); |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
532 if (!chansess->tty) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
533 dropbear_exit("out of memory"); /* TODO disconnect */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
534 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
535 |
33 | 536 pty_setowner(ses.authstate.pw, chansess->tty); |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
537 |
40
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
538 /* Set up the rows/col counts */ |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
539 sessionwinchange(chansess); |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
540 |
40
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
541 /* Read the terminal modes */ |
b4874d772210
- Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
|
542 get_termmodes(chansess); |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
543 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
133
diff
changeset
|
544 TRACE(("leave sessionpty")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
545 return DROPBEAR_SUCCESS; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
546 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
547 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
548 /* Handle a command request from the client. This is used for both shell |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
549 * and command-execution requests, and passes the command to |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
550 * noptycommand or ptycommand as appropriate. |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
551 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
552 static int sessioncommand(struct Channel *channel, struct ChanSess *chansess, |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
553 int iscmd, int issubsys) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
554 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
555 unsigned int cmdlen; |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
62
diff
changeset
|
556 int ret; |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
557 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
133
diff
changeset
|
558 TRACE(("enter sessioncommand")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
559 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
560 if (chansess->cmd != NULL) { |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
62
diff
changeset
|
561 /* Note that only one command can _succeed_. The client might try |
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
62
diff
changeset
|
562 * one command (which fails), then try another. Ie fallback |
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
62
diff
changeset
|
563 * from sftp to scp */ |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
564 return DROPBEAR_FAILURE; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
565 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
566 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
567 if (iscmd) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
568 /* "exec" */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
569 chansess->cmd = buf_getstring(ses.payload, &cmdlen); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
570 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
571 if (cmdlen > MAX_CMD_LEN) { |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
62
diff
changeset
|
572 m_free(chansess->cmd); |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
573 /* TODO - send error - too long ? */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
574 return DROPBEAR_FAILURE; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
575 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
576 if (issubsys) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
577 #ifdef SFTPSERVER_PATH |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
578 if ((cmdlen == 4) && strncmp(chansess->cmd, "sftp", 4) == 0) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
579 m_free(chansess->cmd); |
11
f76c9389e9e0
Mostly done with the listener changeover
Matt Johnston <matt@ucc.asn.au>
parents:
9
diff
changeset
|
580 chansess->cmd = m_strdup(SFTPSERVER_PATH); |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
581 } else |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
582 #endif |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
583 { |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
62
diff
changeset
|
584 m_free(chansess->cmd); |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
585 return DROPBEAR_FAILURE; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
586 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
587 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
588 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
589 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
590 if (chansess->term == NULL) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
591 /* no pty */ |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
62
diff
changeset
|
592 ret = noptycommand(channel, chansess); |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
593 } else { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
594 /* want pty */ |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
62
diff
changeset
|
595 ret = ptycommand(channel, chansess); |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
596 } |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
62
diff
changeset
|
597 |
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
62
diff
changeset
|
598 if (ret == DROPBEAR_FAILURE) { |
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
62
diff
changeset
|
599 m_free(chansess->cmd); |
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
62
diff
changeset
|
600 } |
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
62
diff
changeset
|
601 return ret; |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
602 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
603 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
604 /* Execute a command and set up redirection of stdin/stdout/stderr without a |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
605 * pty. |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
606 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
607 static int noptycommand(struct Channel *channel, struct ChanSess *chansess) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
608 |
fe6bca95afa7
Makefile.in contains updated files required
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609 int infds[2]; |
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610 int outfds[2]; |
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611 int errfds[2]; |
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612 pid_t pid; |
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613 unsigned int i; |
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614 |
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615 TRACE(("enter noptycommand")) |
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616 |
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617 /* redirect stdin/stdout/stderr */ |
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618 if (pipe(infds) != 0) |
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619 return DROPBEAR_FAILURE; |
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620 if (pipe(outfds) != 0) |
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621 return DROPBEAR_FAILURE; |
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622 if (pipe(errfds) != 0) |
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623 return DROPBEAR_FAILURE; |
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624 |
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625 #ifdef __uClinux__ |
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626 pid = vfork(); |
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627 #else |
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628 pid = fork(); |
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629 #endif |
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630 |
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631 if (pid < 0) |
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632 return DROPBEAR_FAILURE; |
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633 |
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634 if (!pid) { |
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635 /* child */ |
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636 |
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637 /* redirect stdin/stdout */ |
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638 #define FDIN 0 |
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639 #define FDOUT 1 |
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640 if ((dup2(infds[FDIN], STDIN_FILENO) < 0) || |
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641 (dup2(outfds[FDOUT], STDOUT_FILENO) < 0) || |
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642 (dup2(errfds[FDOUT], STDERR_FILENO) < 0)) { |
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643 TRACE(("leave noptycommand: error redirecting FDs")) |
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644 return DROPBEAR_FAILURE; |
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645 } |
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646 |
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647 close(infds[FDOUT]); |
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648 close(infds[FDIN]); |
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649 close(outfds[FDIN]); |
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650 close(outfds[FDOUT]); |
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651 close(errfds[FDIN]); |
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652 close(errfds[FDOUT]); |
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653 |
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654 execchild(chansess); |
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655 /* not reached */ |
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656 |
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657 } else { |
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658 /* parent */ |
165
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659 TRACE(("continue noptycommand: parent")) |
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660 chansess->pid = pid; |
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661 |
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662 addchildpid(chansess, pid); |
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663 |
130
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664 if (svr_ses.lastexit.exitpid != -1) { |
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665 /* The child probably exited and the signal handler triggered |
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666 * possibly before we got around to adding the childpid. So we fill |
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667 * out it's data manually */ |
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668 for (i = 0; i < svr_ses.childpidsize; i++) { |
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669 if (svr_ses.childpids[i].pid == pid) { |
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670 svr_ses.childpids[i].chansess->exit = svr_ses.lastexit; |
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671 svr_ses.lastexit.exitpid = -1; |
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672 } |
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673 } |
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674 } |
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675 |
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676 |
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677 close(infds[FDIN]); |
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678 close(outfds[FDOUT]); |
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679 close(errfds[FDOUT]); |
253
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680 channel->writefd = infds[FDOUT]; |
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681 channel->readfd = outfds[FDIN]; |
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682 channel->errfd = errfds[FDIN]; |
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683 ses.maxfd = MAX(ses.maxfd, channel->writefd); |
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684 ses.maxfd = MAX(ses.maxfd, channel->readfd); |
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685 ses.maxfd = MAX(ses.maxfd, channel->errfd); |
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686 |
253
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687 setnonblocking(channel->readfd); |
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688 setnonblocking(channel->writefd); |
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689 setnonblocking(channel->errfd); |
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690 |
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691 } |
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692 #undef FDIN |
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693 #undef FDOUT |
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694 |
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695 TRACE(("leave noptycommand")) |
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696 return DROPBEAR_SUCCESS; |
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697 } |
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698 |
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699 /* Execute a command or shell within a pty environment, and set up |
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700 * redirection as appropriate. |
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701 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
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702 static int ptycommand(struct Channel *channel, struct ChanSess *chansess) { |
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703 |
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704 pid_t pid; |
70
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705 struct logininfo *li = NULL; |
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706 #ifdef DO_MOTD |
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707 buffer * motdbuf = NULL; |
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708 int len; |
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709 struct stat sb; |
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710 char *hushpath = NULL; |
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711 #endif |
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712 |
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713 TRACE(("enter ptycommand")) |
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714 |
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715 /* we need to have a pty allocated */ |
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716 if (chansess->master == -1 || chansess->tty == NULL) { |
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717 dropbear_log(LOG_WARNING, "no pty was allocated, couldn't execute"); |
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718 return DROPBEAR_FAILURE; |
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719 } |
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720 |
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721 #ifdef __uClinux__ |
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722 pid = vfork(); |
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723 #else |
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724 pid = fork(); |
273
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Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents:
264
diff
changeset
|
725 #endif |
4
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
726 if (pid < 0) |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
727 return DROPBEAR_FAILURE; |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
728 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
729 if (pid == 0) { |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
730 /* child */ |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
731 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
732 /* redirect stdin/stdout/stderr */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
733 close(chansess->master); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
734 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
735 pty_make_controlling_tty(&chansess->slave, chansess->tty); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
736 |
fe6bca95afa7
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parents:
diff
changeset
|
737 if ((dup2(chansess->slave, STDIN_FILENO) < 0) || |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
738 (dup2(chansess->slave, STDERR_FILENO) < 0) || |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
739 (dup2(chansess->slave, STDOUT_FILENO) < 0)) { |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
133
diff
changeset
|
740 TRACE(("leave ptycommand: error redirecting filedesc")) |
4
fe6bca95afa7
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parents:
diff
changeset
|
741 return DROPBEAR_FAILURE; |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
742 } |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
743 |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
744 close(chansess->slave); |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
745 |
fe6bca95afa7
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parents:
diff
changeset
|
746 /* write the utmp/wtmp login record - must be after changing the |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
747 * terminal used for stdout with the dup2 above */ |
33 | 748 li= login_alloc_entry(getpid(), ses.authstate.username, |
4
fe6bca95afa7
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diff
changeset
|
749 ses.remotehost, chansess->tty); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
750 login_login(li); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
751 login_free_entry(li); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
752 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
753 m_free(chansess->tty); |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
754 |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
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changeset
|
755 #ifdef DO_MOTD |
24 | 756 if (svr_opts.domotd) { |
4
fe6bca95afa7
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parents:
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changeset
|
757 /* don't show the motd if ~/.hushlogin exists */ |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
758 |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
759 /* 11 == strlen("/hushlogin\0") */ |
33 | 760 len = strlen(ses.authstate.pw->pw_dir) + 11; |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
761 |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
762 hushpath = m_malloc(len); |
33 | 763 snprintf(hushpath, len, "%s/hushlogin", ses.authstate.pw->pw_dir); |
4
fe6bca95afa7
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parents:
diff
changeset
|
764 |
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
765 if (stat(hushpath, &sb) < 0) { |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
766 /* more than a screenful is stupid IMHO */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
767 motdbuf = buf_new(80 * 25); |
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
768 if (buf_readfile(motdbuf, MOTD_FILENAME) == DROPBEAR_SUCCESS) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
769 buf_setpos(motdbuf, 0); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
770 while (motdbuf->pos != motdbuf->len) { |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
771 len = motdbuf->len - motdbuf->pos; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
772 len = write(STDOUT_FILENO, |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
773 buf_getptr(motdbuf, len), len); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
774 buf_incrpos(motdbuf, len); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
775 } |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
776 } |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
777 buf_free(motdbuf); |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
778 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
779 m_free(hushpath); |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
780 } |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
781 #endif /* DO_MOTD */ |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
782 |
fe6bca95afa7
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parents:
diff
changeset
|
783 execchild(chansess); |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
784 /* not reached */ |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
785 |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
786 } else { |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
787 /* parent */ |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
133
diff
changeset
|
788 TRACE(("continue ptycommand: parent")) |
4
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
789 chansess->pid = pid; |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
790 |
fe6bca95afa7
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parents:
diff
changeset
|
791 /* add a child pid */ |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
792 addchildpid(chansess, pid); |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
793 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
794 close(chansess->slave); |
253
84925eceeb13
* rename infd/outfd to writefd/readfd, to avoid confusion
Matt Johnston <matt@ucc.asn.au>
parents:
241
diff
changeset
|
795 channel->writefd = chansess->master; |
84925eceeb13
* rename infd/outfd to writefd/readfd, to avoid confusion
Matt Johnston <matt@ucc.asn.au>
parents:
241
diff
changeset
|
796 channel->readfd = chansess->master; |
4
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
797 /* don't need to set stderr here */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
798 ses.maxfd = MAX(ses.maxfd, chansess->master); |
fe6bca95afa7
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parents:
diff
changeset
|
799 |
109
2e9d1f29c50f
merge of 50be59810e462f9f44f55e421227d6aa0b31982b
Matt Johnston <matt@ucc.asn.au>
parents:
108
diff
changeset
|
800 setnonblocking(chansess->master); |
4
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
801 |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
802 } |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
803 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
133
diff
changeset
|
804 TRACE(("leave ptycommand")) |
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
805 return DROPBEAR_SUCCESS; |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
806 } |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
807 |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
808 /* Add the pid of a child to the list for exit-handling */ |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
809 static void addchildpid(struct ChanSess *chansess, pid_t pid) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
810 |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
811 unsigned int i; |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
812 for (i = 0; i < svr_ses.childpidsize; i++) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
813 if (svr_ses.childpids[i].pid == -1) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
814 break; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
815 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
816 } |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
817 |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
818 /* need to increase size */ |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
819 if (i == svr_ses.childpidsize) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
820 svr_ses.childpids = (struct ChildPid*)m_realloc(svr_ses.childpids, |
264
541b14504870
* fix incorrect array sizing
Matt Johnston <matt@ucc.asn.au>
parents:
253
diff
changeset
|
821 sizeof(struct ChildPid) * (svr_ses.childpidsize+1)); |
4
fe6bca95afa7
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parents:
diff
changeset
|
822 svr_ses.childpidsize++; |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
823 } |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
824 |
fe6bca95afa7
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parents:
diff
changeset
|
825 svr_ses.childpids[i].pid = pid; |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
826 svr_ses.childpids[i].chansess = chansess; |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
827 |
fe6bca95afa7
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parents:
diff
changeset
|
828 } |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
829 |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
830 /* Clean up, drop to user privileges, set up the environment and execute |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
831 * the command/shell. This function does not return. */ |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
832 static void execchild(struct ChanSess *chansess) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
833 |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
834 char *argv[4]; |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
62
diff
changeset
|
835 char * usershell = NULL; |
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
62
diff
changeset
|
836 char * baseshell = NULL; |
4
fe6bca95afa7
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parents:
diff
changeset
|
837 unsigned int i; |
fe6bca95afa7
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parents:
diff
changeset
|
838 |
273
02a80ce2ead4
Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents:
264
diff
changeset
|
839 /* with uClinux we'll have vfork()ed, so don't want to overwrite the |
02a80ce2ead4
Merge of the uClinux-dist patch, should work in inetd mode
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parents:
264
diff
changeset
|
840 * hostkey. can't think of a workaround to clear it */ |
02a80ce2ead4
Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents:
264
diff
changeset
|
841 #ifndef __uClinux__ |
4
fe6bca95afa7
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parents:
diff
changeset
|
842 /* wipe the hostkey */ |
24 | 843 sign_key_free(svr_opts.hostkey); |
844 svr_opts.hostkey = NULL; | |
4
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
845 |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
846 /* overwrite the prng state */ |
272
3be7ae2e8dfa
Only read /dev/random once when the program starts
Matt Johnston <matt@ucc.asn.au>
parents:
264
diff
changeset
|
847 reseedrandom(); |
273
02a80ce2ead4
Merge of the uClinux-dist patch, should work in inetd mode
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264
diff
changeset
|
848 #endif |
4
fe6bca95afa7
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changeset
|
849 |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
850 /* close file descriptors except stdin/stdout/stderr |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
851 * Need to be sure FDs are closed here to avoid reading files as root */ |
208
1a52846ec11f
* fix off-by-one closing open FDs
Matt Johnston <matt@ucc.asn.au>
parents:
204
diff
changeset
|
852 for (i = 3; i <= (unsigned int)ses.maxfd; i++) { |
277
044bc108b9b3
* Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents:
264
diff
changeset
|
853 m_close(i); |
4
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
854 } |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
855 |
fe6bca95afa7
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parents:
diff
changeset
|
856 /* clear environment */ |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
857 /* if we're debugging using valgrind etc, we need to keep the LD_PRELOAD |
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
858 * etc. This is hazardous, so should only be used for debugging. */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
859 #ifndef DEBUG_VALGRIND |
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860 #ifdef HAVE_CLEARENV |
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861 clearenv(); |
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862 #else /* don't HAVE_CLEARENV */ |
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863 /* Yay for posix. */ |
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864 if (environ) { |
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865 environ[0] = NULL; |
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866 } |
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867 #endif /* HAVE_CLEARENV */ |
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868 #endif /* DEBUG_VALGRIND */ |
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869 |
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870 /* We can only change uid/gid as root ... */ |
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871 if (getuid() == 0) { |
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872 |
33 | 873 if ((setgid(ses.authstate.pw->pw_gid) < 0) || |
874 (initgroups(ses.authstate.pw->pw_name, | |
204
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875 ses.authstate.pw->pw_gid) < 0)) { |
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876 dropbear_exit("error changing user group"); |
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877 } |
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878 if (setuid(ses.authstate.pw->pw_uid) < 0) { |
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879 dropbear_exit("error changing user"); |
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880 } |
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881 } else { |
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882 /* ... but if the daemon is the same uid as the requested uid, we don't |
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883 * need to */ |
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884 |
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885 /* XXX - there is a minor issue here, in that if there are multiple |
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886 * usernames with the same uid, but differing groups, then the |
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887 * differing groups won't be set (as with initgroups()). The solution |
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888 * is for the sysadmin not to give out the UID twice */ |
33 | 889 if (getuid() != ses.authstate.pw->pw_uid) { |
4
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890 dropbear_exit("couldn't change user as non-root"); |
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891 } |
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892 } |
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893 |
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894 /* an empty shell should be interpreted as "/bin/sh" */ |
33 | 895 if (ses.authstate.pw->pw_shell[0] == '\0') { |
4
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896 usershell = "/bin/sh"; |
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897 } else { |
33 | 898 usershell = ses.authstate.pw->pw_shell; |
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899 } |
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900 |
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901 /* set env vars */ |
33 | 902 addnewvar("USER", ses.authstate.pw->pw_name); |
903 addnewvar("LOGNAME", ses.authstate.pw->pw_name); | |
904 addnewvar("HOME", ses.authstate.pw->pw_dir); | |
4
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905 addnewvar("SHELL", usershell); |
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906 if (chansess->term != NULL) { |
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907 addnewvar("TERM", chansess->term); |
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908 } |
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909 |
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910 /* change directory */ |
33 | 911 if (chdir(ses.authstate.pw->pw_dir) < 0) { |
4
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912 dropbear_exit("error changing directory"); |
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913 } |
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914 |
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915 #ifndef DISABLE_X11FWD |
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916 /* set up X11 forwarding if enabled */ |
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917 x11setauth(chansess); |
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918 #endif |
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919 #ifndef DISABLE_AGENTFWD |
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920 /* set up agent env variable */ |
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921 agentset(chansess); |
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922 #endif |
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923 |
70
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924 /* Re-enable SIGPIPE for the executed process */ |
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925 if (signal(SIGPIPE, SIG_DFL) == SIG_ERR) { |
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926 dropbear_exit("signal() error"); |
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927 } |
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928 |
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929 baseshell = basename(usershell); |
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930 |
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931 if (chansess->cmd != NULL) { |
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932 argv[0] = baseshell; |
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933 } else { |
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934 /* a login shell should be "-bash" for "/bin/bash" etc */ |
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935 int len = strlen(baseshell) + 2; /* 2 for "-" */ |
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936 argv[0] = (char*)m_malloc(len); |
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937 snprintf(argv[0], len, "-%s", baseshell); |
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938 } |
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939 |
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940 if (chansess->cmd != NULL) { |
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941 argv[1] = "-c"; |
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942 argv[2] = chansess->cmd; |
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943 argv[3] = NULL; |
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944 } else { |
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945 /* construct a shell of the form "-bash" etc */ |
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946 argv[1] = NULL; |
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947 } |
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948 |
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949 execv(usershell, argv); |
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950 |
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951 /* only reached on error */ |
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952 dropbear_exit("child failed"); |
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953 } |
9
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954 |
7 | 955 const struct ChanType svrchansess = { |
956 0, /* sepfds */ | |
957 "session", /* name */ | |
958 newchansess, /* inithandler */ | |
959 sesscheckclose, /* checkclosehandler */ | |
960 chansessionrequest, /* reqhandler */ | |
961 closechansess, /* closehandler */ | |
962 }; | |
963 | |
964 | |
965 /* Set up the general chansession environment, in particular child-exit | |
966 * handling */ | |
967 void svr_chansessinitialise() { | |
968 | |
969 struct sigaction sa_chld; | |
970 | |
971 /* single child process intially */ | |
972 svr_ses.childpids = (struct ChildPid*)m_malloc(sizeof(struct ChildPid)); | |
973 svr_ses.childpids[0].pid = -1; /* unused */ | |
974 svr_ses.childpids[0].chansess = NULL; | |
975 svr_ses.childpidsize = 1; | |
133
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976 svr_ses.lastexit.exitpid = -1; /* Nothing has exited yet */ |
7 | 977 sa_chld.sa_handler = sesssigchild_handler; |
978 sa_chld.sa_flags = SA_NOCLDSTOP; | |
979 if (sigaction(SIGCHLD, &sa_chld, NULL) < 0) { | |
980 dropbear_exit("signal() error"); | |
981 } | |
982 | |
983 } | |
984 | |
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985 /* add a new environment variable, allocating space for the entry */ |
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986 void addnewvar(const char* param, const char* var) { |
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987 |
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988 char* newvar = NULL; |
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989 int plen, vlen; |
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990 |
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991 plen = strlen(param); |
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992 vlen = strlen(var); |
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993 |
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994 newvar = m_malloc(plen + vlen + 2); /* 2 is for '=' and '\0' */ |
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995 memcpy(newvar, param, plen); |
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996 newvar[plen] = '='; |
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997 memcpy(&newvar[plen+1], var, vlen); |
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998 newvar[plen+vlen+1] = '\0'; |
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999 if (putenv(newvar) < 0) { |
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1000 dropbear_exit("environ error"); |
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1001 } |
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1002 } |